42805837 has 2 divisors, whose sum is σ = 42805838. Its totient is φ = 42805836.

The previous prime is 42805817. The next prime is 42805843. The reversal of 42805837 is 73850824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41332041 + 1473796 = 6429^2 + 1214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42805837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42805796 and 42805805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42805817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21402918 + 21402919.

It is an arithmetic number, because the mean of its divisors is an integer number (21402919).

Almost surely, 2^42805837 is an apocalyptic number.

It is an amenable number.

42805837 is a deficient number, since it is larger than the sum of its proper divisors (1).

42805837 is an equidigital number, since it uses as much as digits as its factorization.

42805837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 42805837 is about 6542.6169840516. The cubic root of 42805837 is about 349.8117000734.

The spelling of 42805837 in words is "forty-two million, eight hundred five thousand, eight hundred thirty-seven".